[page-blob] introduce IfMatch header to put request

[goksgie]

The Azure Docs do not mention, but we can prevent accidental overwrites to Azure Page Blobs when two parties issue a create request. This can be prevented through IfMatch headers, as this commit introduces.

As of today, the only alternative option to prevent overwrite would be managing an internal blob service, or checking whether it exists before issuing a create request (which introduces an additional round-trip).

For C# equivalent, please see: https://github.com/Azure/azure-sdk-for-net/blob/fb0b80d4c8fc99e9e964862f2a374d2bc28096f7/sdk/storage/Azure.Storage.Blobs/src/PageBlobClient.cs#L844

[goksgie]

@microsoft-github-policy-service agree company="Microsoft"

[heaths]

The main branch is unsupported and should not be used in production. You might want to check if this is already implemented in the feature/track2 branch or retarget there if not.

[goksgie]

hey @heaths , thanks for quick response. I don't see any code under storage directory in the branch you've suggested. I assume that is still under development.

But, please redirect me otherwise. Thanks!

[heaths]

The storage team is working on a new crate. Keep in mind what's under main right now is unsupported.

[heaths]

main branch has been moved to legacy. Retargeting some old PRs.

[goksgie]

@heaths , would it be possible to merge this to "legacy" branch? We'll possibly use cargo syntax to consume this specific change to simplify the code until we acquire more clarity around official Azure Storage SDK.

[heaths]

@goksgie you already can without me merging it. Just point to your topic branch. Even if I did merge it, we have no plans for further releases from the legacy branch at this time i.e., it won't be on crates.io and you'd have to reference a commit anyway.